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首页> 外文期刊>Journal of Materials Research >Probing the local creep mechanisms of SiC/SiC ceramic matrix composites with high-temperature nanoindentation
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Probing the local creep mechanisms of SiC/SiC ceramic matrix composites with high-temperature nanoindentation

机译：用高温纳米狭窄探测SiC / SiC陶瓷基复合材料的局部蠕变机制

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摘要

Here, we probed the local creep response of SiC/SiC ceramic matrix composites via high-temperature indentation to examine the contributions of heterogeneous microstructure to creep. Indentations were conducted up to 800 °C on single and polycrystalline Si and SiC, reaction-bonded SiC, and the SiC/SiC composite, which indicated higher creep strain rates of polycrystalline materials yet uncovered comparably lower strain rates of the SiC/SiC composite. Indentation creep rate was observed to be highly dependent on contact stresses. An analytical creep model was presented based on a rule of mixtures approach to incorporate material heterogeneity of the SiC/SiC composite. A finite element model was applied to predict the indentation deformation zone, in which the composite constituents would jointly influence the creep response. The analytical model was then solved for temperatures up to 800 °C and exhibited good agreement with experimental measurements.
机译：这里，我们通过高温凹口探测SiC / SiC陶瓷基质复合材料的局部蠕变响应，以检查异质微观结构蠕变的贡献。 在单晶Si和SiC，反应键合的SiC和SiC / SiC复合材料上进行凹口高达800℃，表明多晶材料的较高蠕变应变速率尚未露出的SiC / SiC复合材料的较低应变率。 缩进蠕变率被观察到高度依赖于接触应力。 基于混合物方法的规则提出了一种分析蠕变模型，以掺入SiC / SiC复合材料的材料异质性。 应用有限元模型来预测压痕变形区，其中复合成分将共同影响蠕变反应。 然后解决了分析模型的温度高达800°C，并与实验测量表现出良好的一致性。

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  • 来源
    《Journal of Materials Research》 |2021年第12期|2420-2433|共14页
  • 作者

    Clifton H. Bumgardner; Jason D. Baker; Andrew J. Ritchey; Xiaodong Li;

  • 作者单位

    Department of Mechanical and Aerospace Engineering University of Virginia 122 Engineer's Way Charlottesville VA22904 USA;

    Rolls-Royce Corporation 450 S. Meridian St. Indianapolis IN 46225 USA;

    Rolls-Royce Corporation High Temperature Composites 5730 Katella Ave Cypress CA 90630 USA;

    Department of Mechanical and Aerospace Engineering University of Virginia 122 Engineer's Way Charlottesville VA22904 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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